Sewing-machine.



.A. R, SCHOENKY.

SEWING MACHINE. v

APPLlcAxoN FILED 1AN.21.1914.

LQBZI. Patented June 12., 1917.

3 SHEETS--SHEET l.

A. H. SCHOENKY.

SEWING MACHINE.

APPLICATION FILED HINJT. 19M.

Patented June 12, ,41917.y

3 SHEETS-SHEET 2.

I I v 5 I i' A. R, SCHOENKY.

SEWING MACHINE. APFLICATloN FILED 1AN.21,1914.

Patented June 12, 1917.

n 3 SHEETS-SHEET 3.

AUGUST R. SCHOENKY,`OF SOMERVILLE, MASSACHUSETTS, .,ASSIGNORLT-O REECSHOE MACHINERY COMPANY, F BOSTON',v MASSACHUSETTS, A CORPORATION O1?MAINE SEWING-Macuarium To all whom t may concern:

Be it known that ll, AUGUST R. ScHoENKY, a citizen of the United States,residing at Somerville in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements in'Sewing-Machines, of which the following is aspecification,referencebeing had therein to the accompanying drawing. This inventionrelates to sewing machines,

and for convenience the invention is illusy trated in connection withthat type of machine used in the manufacture of shoes by the welt systemfor, stitching together the outsole and welt.

In this class and other classes of sewing machines it is sometimesprovided that the presser-foot be clamped or locked upon the work. Forexample, it may be intermittently clamped and released during thestitchingk of a shoe, the feed of the work occurring when the clampingpressure is released and the operation of the needle and a'Wl occurringwhen the presser-foot is locked under .clamping pressure. In such a'case, there will be means for imposing a light pressure upon thepresser-foot alternately with the heavy clamping or locking` action.

When such a sewing machine is brought to rest by any stop mechanism ordevice operated either at will or upon an emergency or otherwise, thepresser-foot will be incapable of being lifted to extract the work, iflocked under the heavy clamping pressure.

It is an object of this invention to provide for the release of thepressure-foot from the clamping or locking action upon the stoppage ofthe machine in any manner, and particularly to effect this result duringthe operation of the stopping devices of the mav chine. Other objectshereof will be developed during the hereinafter following description ofone illustration of a machine embodying the invention. v

To the attainment of such objects, the invention consists inthe novelcombinations, mechanisms, devices, arrangements and other featuresdescribed or shown herein.

Figure 1 is a front elevation of a shoe outsole sewing machine in whichthe present invention has been incorporated, the parts- Specification ofLetters Patent. vPa, 1lj11i,f5d Jun@ i2, 1911i?. Application'led January2,7, 1914. Serial No. 814,631. i i i i vbeing shown in theirv properadjustment when the machine is in full operation.

Fig. 2 1s a partial right elevation, and partsection taken upon theplane 4 4 of FigI 1, the parts being in running adjustment. Fig.- 3shows the lever 121 detached fromv the other parts in Fig. 2.

Fig. 4 is a. view vsimilar to Fig. 2' showing -the parts in theiradjustment when the ma vchine has been vbrought to rest. d Fig. 5 is aplan view, partly in section, on

the plane 545 of Fig. 1.

Fig. y6 is a partial front elevation on an enlarged scale of themechanism seen in Fig. 5.1

Fig. 7 isa vertical section taken upon the plane 7-7 of Fig. 5 or Fig.6.

Fig. 8 shows the face of the toothed stop cam 69.

Fig. 9 is a right elevation of certain parts I shown inFigs. 2, 3 andel, illustrating certain features in detail, and Fig. 10 is a frontelevation of the parts shown in Fig. 9.

Similar reference numerals .designate corresponding parts in the severalviews.

The'illustrated machine comprises, in connection with the stitchingmechanism, the driving mechanism therefor, and the stopping devices, a'means brought into action by the stoppage of the machine for effectingthe unlocking or unclamping of the presserfoot, thus permitting theextraction of the work; and in connection with these parts is shown atreadle or lever which-may be depressed or thrown for elevating thepresser-foot after the stoppage of themachine. These parts` coperate invthat the presser-foot releasing means unlocks the presser-foot, therebyafterward permitting the treadle to lift the presser-foot, vWhereotherwise the villustrated treadle wouldv be uously running and operatesthrough the .cams toel'ect the movements of the needle and other partsof the stitching mechanism.

work. At the foot of the machine is shown a treadle 32 from whichextends upwardly a treadle rod 33 through which the presserfoot may belifted by connections'hereinafter to be described.

For driving the main shaft 13 the following driving mechanism may beemployed, with which is incorporated a stopplng contrivance capable ofmaking an adjustment between running adjustment and stopping adjustment.llhe illustrated drlvlng mechanism and stopping contrivances are notherein claimed per se, as they form the subject of prior Patent No.1,085,093, issued January 20, 1914, which patent may be referred to formore complete details of structure and operation. a

The power shaft 41 may be drlven by belt pulleys. This shaft extendsforwardly f transmitted to the main shaft 13.

and rearwardly, and in front of it stands a cross shaft 46. Rotation istransmitted from shaft 41 to shaft 46 by a variable speed transmitter ofthe face friction type involving a friction disk 47 on the'shaft 41 anda friction wheel 49 on the shaft 46. The wheel slides -upon its shaft bya spline 50 and the shaft is supported in bearings 51. At the `right endof the shaft 46 is a pair of helical gears 52 by which the rotation istransmitted to the upright shaft 53, having a similar pair of helicalgears 54 by which the rotation 1s collar affording a groove for a ring56 engaged by the upper end of bell crank 57 and whose horizontal arm atthe extremity has al slotted connection 58 to a vertical rod 65. Aspring 66, inclosed in barrel 67, tends to lift the rod 65 and therebyadjust the variable speed transmitter to full speed position. At theupper end of rod 65 is a connection by which the rotation of the mainshaft may effect an adjustment of the transmitter toward zero, so thatthe main shaft effects its own stoppage. This connection, which isnormally disconnected, but may beconnected at suitable times, forexample, at will, comi Laaaeae prises a cam follower or stud 68 on therod 65 and a cam disk 69 having a spiral groove l 70, as seen in Fig. 8.The cam69 is mounted mentioned parts come to rest. lt will be understoodthat the friction disk 47 is continuously-rotating, but that, when-themachine 1s stopped, the parts 49, 46,53, 13, 73 and 69 simultaneousl,come to rest.

In order. to effect this stopping action at will, a grooved collar 74 isattached to thek stopping cam 69 and is provided with connections to aknee lever 75, which may be thrown at will to slide the cam 69 to rightor left. When slid to the right the machine is brought, without shock,to rest, as described.

When slid to the left, the cam and follower disengage and thereupon thespring 66, which has been compressed during the stopping action,reassertsitself to gradually shift the friction wheel across the disk,thereby restoring the machine toy full speed.

Convenientconnections between the lever 75, moved at will, andthe collar74 comprise a bell crank 6, whose upper portion engages the collar andwhose horizontal arm is jointed to a link, 77 extending downwardly towhere it is jointed to a second bell crank lever 78, whose downward armengages a slide 7 9`connected by a short link 80 to the knee` lever 75.When the knee lever is thrown to the right, the parts 79, 80, are thrownto the left, link 77 is lifted and the cam 69 is moved to the right tostop the machine, and the reverse of these movements restarts themachine.

rThe cam groove 7 0 of cam 69 may have an inner concentric portion 81 toassist engaging with the follower, followed by anfeccentric portion 82corresponding substantially to a half turn of the cam or a full turn ofthe main shaft, and finally a concentric outer portion 83 at the properdistance from the center to bring the follower 68 and the partsconnected with it to zero or stopping adjustment. l

Now will beA first described the presserfoot connections and theintermittent clamping or locking means therefor, and thereafter themeans whereby the stoppage of the machine unclamps or unlocks thepresserfoot to permit the lifting thereof and the extraction of thework.-

Referring to Figs. 2 and 4, the top of the treadle rod 33 is providedwith a projection 100. A short arm 101l has its forward end pivoted tothe head ofthe rod to give it guidance in its up-and-down movements.

. The projection 100 stands directly over -a stud 102 upon the forwardend of arm 104 fast upon the cross shaft 103, whichy takes part incontrolling the amount ofy ythread measured. When .the treadle .isdepressed, the rod 33 brings the projection 100 into contact with thestud 102, so as to swing the shaft 103 of the arm 104 downward. Thisaction tends to lift the .presser-foot through a link 105, connectingthe arm 104 with the rear arm or extension 106 of the presser-foot 24.Ordinarily, however, the depression of the treadle and rod could noteffect this lifting when the presser-foot is clamped under pressure.Spring 107 tends to rotate shaft 103 and hold the presser-foot on thework.

The devices b which the presser-foot is intermittently c amped underpressure include a dog 110 engaging a rack 111 supported at the rear endofan arm 112 which is connected by a powerful spring device 113 with therear extending arm 106 of the presser-foot; while the arm 106 at itsrear end is provided with a rack 115 engaged by a triple dog114. Springs116,117, tend to hold the dogs against their racks. A cam lever 118,operated from groove 119 in cam disk 17 through stud 120, serves tointermittently clamp and release the presser-foot. During the formationof each stitch the lever 118 is forcibly depressed, and, after thefeeding movement, is forcibly lifted. When the lever 118 is depressed,its heel disengages the dog 114, while the dog 110, being pivoted to thelever 118, is at the same time disengaged. When the lever is lifted, dog110 forces upwardly the rack 111 and arm 112 imposes the heavy springpressure of 113 upon the presser-foot, whereupon the triple dog'114clamps or locks the parts in this positlon.

For disengaging the dogs to unclamp or unlock the presser-foot at othertimes than upon the lowering of the lever 118, the following devices maybe employed: An unclamping lever 121 is loosely mounted upon the sainepin or pivot 123 as that carrying the triple under-dog 114. The lever121, which is in the shape of a bell crank, has an upward arm 122,which, when thrown rearward, contacts and presses the pins 124 and 125respectively of the upper and underdogs, so as to throw both dogs out ofengagement'with their racks. The horizontal arm of the lever 121 isshown connected by a downward rod 126 to that portion of the mechanismwhich serves to automatically unclamp the presser-foot upon the stoppageof the machine. From the above description, it will be seen that thedepression of the rod 126 swings the bell crank lever 121 to disengagethe dogs, thus leaving the presseifoot free to be lifted, whereupon thetreadle 32 can be thrown by the 'operator to lift the presser-foot.

The means whereby the stoppage 'of the i machine effects the pullingdown of the rod 126 for this purpose is shown generally in Fig. l, andmore and 7.

It has been explained that, when the operator throws the knee lever 7 5,the machin'e is brought to a stop by the adjustment of the transmltter47, 49, to zero position. By reason of this stopping action the bell'crank lever 57 is thrown and, for convenience, the

particularly in Figs. 5, 6 l

motion of the bell crank lever is taken advantage of for lattaining theend in view. Attac ed to the bell crank or the stud carrying it is athird arm 127 connected by a link 128 to a hooked rod 129, the hook ofwhich consists of an offset portion at the top. The hooked rod movesdown whenever the machine is stopped, and is adapted to make engagementwith the rod 126 at the proper time, so as to pull the latter down forun- .clamping the presser-foot. The hook and rod are shown disengaged inFig. 1, but engaged in Figs. 5 and 6.

Normally the rod 126 is pushed up by spring 130, the lower end of thespring abutting against a fixed platform 131 and the rod having a blockor col-lar 132 thereupon. As seen in Fig. 7, the springs platform 131 isheld by a fixed standard 133 extending downwardly from a fixed framemember 134.

The engagement and disengagementl between members 129 and 126 is edectedby a horizontal sliding shoe 135, fitted within a groove in front of theblock 132. The shoe is moved vfrom the right-hand position of Fig. 1 tothe left-hand position of Fig. 6,

and vice versa, through a pin 136 forwardly projecting from the shoe andengaging a. vertical slot in a block 137 extending downwardly from thelink 80, which connects the machine comes to rest, the down ,movementvof the hook causes it to engage and pull down upon the shoe, andtherefore the block 132 and rod 126, for unclampinglthe presser-'1 foot,so that the work can thereupon be withdrawn from under the latter.

` The described mechanism permitting the engagement and disengagement ofparts 135 and 129 constitutesva convenient means of restoringthe`presser-foot clamping devices or dogs to their normal or operativecondiand means subse uently operable at the will of the operator fromthe work.

5. In a sewing machine, the combination of stitching mechanism,mechanism for driving the stitching mechanism, an adjustablework-engaging member, means for clamping said member upon the work, anunclamping device, a sto ping means for slowing and finally stopplng thestitching mechanism from its forward drive in a definite position, and`a controller having separate connections for operating both said orremoving said member stopping means and unclamping device,

whereby said member is'unclamped as the forward drive of the machineceases.

6. In a sewing machine, the combination )of stitching mechanism,mechanism for driving the stitching mechanism, an adjustablework-engaging member, means for clamping said member upon the work,including a pressure-applying clamp and a locking clamp., an unclampingmeans adapted to release both clamps, a stopping means for finallystopping the stitching action from its forward operation, and a singlecontroller for operating said stopping means and said unclamping means,whereby as the forward drive of the machine ceases the said member isreleased, and means subsequently operable at the will of the operatorfor removing said member from the work.

7. In a sewing machine, the combination of stitching mechanism,mechanism for driving the stitching mechanism, an adjustablework-engaging member, means for clamping said member upon the work, anunclamping device, a stopping means, and connections actuated by saidAstopping means foractuating said unclamping device, whereby said memberis unclamped as the stitching ceases, the described elements constructedand arranged to permit the reclamping of said member with the resumptionof stitching and means operable at will while the machine is stopped forremoving said member from the work and restoring it to the work prior tothe restarting of the machine.

8. In ansewing machine, the combination of stitching mechanism,-mechanism for driving the stitching mechanism, an adjustablework-engaging member, means for clamping said member upon the work,including a pressure-applying clamp and a locking clamp, an unclampingmeansadapted to release both clamps, aA stopping means for stopping thestitching action, and a single controller for operating said stoppingmeans and said unclamping'means, whereby as the stitching ceases thesaid member is released, the described elements constructed and arranged.to permit the reclamping of said member with the resumption ofstitching and means operable at will while themachine is stopped forremoving said member from the work and restoring it to the 'Work priorto the restartingof the machine.

9. In a sewing machine, the combination of stitching mechanism,mechanism for driving the stitching mechanism, an adjustablework-engaging member, means' for .clamping said member upon the work, anunclamping device for throwing the clamping means out of engagement, astopping means for slowing and finally stopping'the stitching mechanismfrom its forward drive in a definite position, and a controller havingseparate connections arranged in one adjustment to first initiate thestoppage of stitching and then operate the unclamping device as thestitching ceases, and in another adjustment to first render theunclamping device inoperative and then pause normal stitching to resume.

10. In a sewing machine, the combination of stitching mechanism,mechanism including a variable speed transmitter for driving thestitching mechanism, an adjustable work-engaging member, means forclamping said member upon the work, and means operative at suitabletimes for adjusting said transmitter to zero and for automaticallyeffecting the unclamping of said member.

-1,1. In a sewing machine, the combination of stitching mechanism,mechanism including a vvariable speed transmitter for` driving thestitching mechanism, an adjustable :ing -thereupon ceases and the memberis unclamped..

' 12. In a sewing machine, the combination of stitching mechanism,mechanism'including .an adjustable transmitter for driving the stitchingmechanism, an adjustable work-engaging member, means for clamping saidmember upon the work, an unclamping device, an automatically movablepart, con-4 nections extending from said device to said automaticallymovable part, and a single controller for controlling said connectionsand said transmitter.

13. In a sewing machine, the combination of stitching'mechanism,mechanism includv ing an adjustable transmitter for driving thestitching mechanism, an adjustable work-engaging member, means forclamping said member upon the work, an unclamping device, a controllerfor controlling the running or stopping adjustment of said transmitter,'a pair of engagers, as 129, 135, between an automatic part and saiddevice,

gages them upon resumption of stitching.

14. ln a sewing` machine, the combination of stitching mechanism,mechanism including an adjustable transmitter for driving the stitching"mechanism an adjustable work-engaging member, means for clamping saidmember upon the work, an unelamping device,V connections .whereby arunning` part of the machine may adjust said kvtransmitter' to zero, acontroller governing the operative or inoperative condition of saidconnections, a contrivance actuated hy the adjustment of thetransmitter1 to zero for operating said unclamping device, and meanswhereby said controller also l governs the operatveness orinoperativeness of said contrivance, such that for one adjustment of thecontroller the contrivance is rendered operativeand said connectionsstop the machine and operate the unclamping device, while a reverseadjustment renders the contrivance inoperative, and restarts themachine. Y

ln testimony whereof l aiX my signature in presence of two witnesses.

AUGUST n. soutenant. vVtitnesses v F. A. SHEA, J. WARREN NICHOLS.

